JP6395477B2 - Underwater bearing structure and vertical shaft pump - Google Patents

Description

  The present invention relates to an underwater bearing structure and a vertical shaft pump.

  FIG. 6 is a diagram showing an overall configuration of a conventional vertical shaft pump to which a lubricating water recovery pipe is attached. The vertical shaft pump 1 includes a rotary shaft 2 extending in the vertical direction, an impeller 3 attached to a lower end portion of the rotary shaft 2, a driving machine (not shown) attached to an upper end of the rotary shaft 2, a rotary shaft 2 and an impeller. A cylindrical casing enclosing 3. The vertical shaft pump 1 is a pump that pumps up water from below through a casing by rotating the impeller 3 with a driving machine.

  The casing that surrounds the rotating shaft 2 and the impeller 3 includes four parts. That is, the casing includes a suction bell 4 that is a pump suction port, a guide blade 20 that converts the swirling component of the water flow pumped by the impeller 3 into a vertically upward component, and an underwater bearing (slide bearing) 21A that supports the rotating shaft 2. The discharge bowl 5, the suspension pipes 6A, 6B connected to the upper part of the discharge bowl 5 and extending to a desired height to pump water, and the direction of the flow of the pumped water connected to the suspension pipes 6A, 6B A discharge elbow 7 is provided to change the direction to a desired direction. The suction bell 4, the discharge bowl 5, the suspension pipes 6 </ b> A and 6 </ b> B, and the discharge elbow 7 are fastened with flanges to form the casing of the vertical pump 1.

  The vertical shaft pump 1 further includes underwater bearings 21 </ b> B and 21 </ b> C that support the rotary shaft 2. The underwater bearings 21B and 21C are supported on the casing by the underwater bearing supports 22A and 22B. The vertical pump 1 itself has a suspension pipe inserted into the opening hole 101 of the installation floor 100 and is fixed to the installation floor 100 at the lower part of the discharge elbow 7. Below the installation floor 100, an intermediate floor 103 is provided for installation and inspection, and the suspension pipe 6A is installed so as to be inserted into the opening hole 101 of the intermediate floor 103.

  Some vertical shaft pumps 1 are installed and used in a pump station to draw water flowing from a tributary river or sewer into the pump station and to send rainwater to a main river.

  The drained water contains a large amount of particulate foreign matter and pebbles called slurry such as sand. In addition, seawater flows into rivers and sewage near the coast, and may contain shells as well as sea sand and stones. The sewage containing these slurries or the like may enter the pump and cause wear deterioration of the metal that is a constituent material of the pump. In particular, in a portion that functions by a narrow clearance, such as the rotating shaft 2 in the casing and the underwater bearings (slide bearings) 21A, 21B, and 21C, the slurry enters the clearance, and the rotating body and the stationary body that form the clearance It may accelerate the wear of the wall surface and greatly affect the pump life.

  Further, the pump is stopped when the water in the pump station is not accumulated, and when the pump is stopped, the underwater bearing portion in the casing is in a dry environment free of lubricating water. However, once a tributary river or sewer overflows into the pump station due to heavy rain, long rain, or unexpected torrential rain, it is necessary to start the pump quickly in order to pump out the water. Therefore, the submerged bearing must be lubricated prior to starting the pump.

Therefore, in order to lubricate the underwater bearing prior to starting the pump while preventing the slurry from entering the underwater bearings 21A, 21B and 21C in the casing, conventionally, the rotary shaft 2 of the vertical pump and the It is known that a protective tube 23 surrounding the bearings 21A, 21B, and 21C is provided, and clean lubricating water is allowed to flow into the space between the protective tube 23 and the rotary shaft 2. As shown in FIG. 6, the flowing water is obtained by flowing clean lubricating water from a clean water tank 102 placed on an installation floor or the like into a flow path between the protective tube 23 and the rotary shaft 2, and discharging the bowl 5. Some of the lubricating water that has flowed down to the portion is taken out of the casing through the communication pipe 24, and is recovered and circulated again to the water tank 102 through the lubricating water recovery pipe 25.

  By doing in this way, it is possible to confirm the lubrication status of the submersible bearing by checking the status of the lubrication water during the operation of the pump, and from the state of the water surface of the water tank 102, It is possible to supply clean water appropriately.

  In addition, a lubricating water recovery pipe is provided inside the casing of the discharge bowl 5 portion, and is collected and circulated directly in the flow path between the upper protective pipe and the shaft without going through the water tank 102. Or just let the water flow to the discharge bowl through the flow path between the protective tube and the shaft, and let the water leak from the discharge bowl to the pump sewage, or just clean the space between the protective tube and the shaft. Some contain water. However, there are problems such that the lubrication condition of the bearing cannot be confirmed by looking at the condition of the lubricating water after operation, and that the operation cannot be performed when the clean water is insufficient (see Patent Documents 1 to 3).

Japanese Utility Model Publication No. 60-178397 Japanese Utility Model Publication No. 04-8797 Japanese Patent Laid-Open No. 06-66286

  By the way, there is the following problem even in a system in which lubricating water is taken out of the casing from the side of the discharge bowl and the lubricating water is collected and circulated. The first is a problem in manufacturing the discharge bowl. FIG. 7A is a state diagram of the impeller and the guide vane as seen through the casing of the vertical shaft mixed flow pump, and FIG. 7B is a plan view of the guide vane as viewed downward from the shaft side. In the discharge bowl, guide vanes 20 of the discharge bowl 5 are arced in the circumferential direction as shown in FIG. 7B for rectification, and spiral in the axial direction as shown in FIG. 7A. It has a three-dimensional curved surface.

  The discharge bowl 5 is manufactured by casting iron-based metal. That is, in the manufacture of the discharge bowl, the steel pipe of the communication pipe 24 is previously installed in the sand mold, and molten iron-based metal hot water is poured into the mold. Therefore, in order to discharge the communicating pipe and connect the guide pipe 20 along the guide blade 20 so as to communicate from the center of the bowl to the outside of the casing, it is necessary to directly cast the communicating pipe.

  The shape of the discharge bowl 5 is composed of a plurality of three-dimensionally curved blades, an inner chamber, and the like. Since the shape is complicated, it takes a lot of labor to manufacture a sand mold. In addition, if the communication pipe 24 is installed in a part of the discharge bowl 5, the number of man-hours for production increases, and the steel pipe is embedded in the blade, so that the shape of the guide blade is restricted.

  Next, there is a problem of the influence of rectification performance and wear of the guide blade 20. The sewage containing slurry flows through the outer surface of the guide vane with the communication pipe 24 built in, and is rectified. However, if the thickness of the communication pipe 24 is maintained, the portion swells, so that the flow passes through the communication pipe 24. This is different from the flow of other guide blades that are not built in and do not have swelling, and the symmetry about the rotation axis 2 is lost. Therefore, there is a risk of drift, which may affect the behavior of the pump.

Further, since the guide vane 20 performs a rectifying action, wear due to the slurry is likely to proceed, so that the embedded communication pipe 24 may be worn and a hole may be opened. Even if the communication pipe 24 that leads from the center of the discharge bowl 5 to the outside of the casing is not directly along the guide vanes but is directly piped, there is a risk of drifting due to the influence of the flow, There was a similar risk of pipe wear.

  Finally, there is a problem of installation possibility. In the vertical pump 1 in which the discharge bowl 5 has a larger diameter than other casings such as the suspension pipes 6A and 6B, the lubricating water recovery pipe 25 extends upward from the outside of the outer periphery of the discharge bowl 5, so When the pump 1 is installed, the lubricating water recovery pipe 25 may interfere with the opening hole 101. Therefore, in the case of a machine place where the opening area of the opening hole 101 is limited, it may be difficult to install the pump.

  That is, as shown in FIG. 6, when the hole diameter of the opening hole 101 is close to the diameter of the bowl 5, the lubricating water recovery pipe 25 interferes with the installation floor 100 and the intermediate floor 103. Although it is conceivable to expand the hole diameters of the opening hole 101 and the opening hole 101 of the intermediate floor 103 to the broken line shown in the figure, the hole diameter of the opening hole 101 of the installation floor 100 and the intermediate floor 103 installed in the pump station is It is determined when the machine is constructed, and it is difficult to easily widen the hole diameter. Therefore, even if the hole diameter is a minimum size, it is necessary that the lubricating water recovery piping 25 protruding outside the vertical shaft pump does not contact the installation floor 100 or the intermediate floor 103 and does not hinder the installation at the site. There is.

  In view of the above situation, the subject of the present invention is the structure and manufacturing restrictions of the discharge bowl due to the routing of the piping, the influence of the rectification performance by the guide blades of the discharge bowl, the risk of wear of the guide blades, It is to provide an underwater bearing structure and a vertical shaft pump that can be reduced and can be installed even with a minimum hole diameter of an installation floor or the like.

  One form of the underwater bearing structure of the present invention is made in view of the above problems, and is an underwater bearing structure that supports a rotating shaft to which an impeller of a vertical pump is attached, and a plurality of underwater bearings that support the rotating shaft. A first protective tube that contains and fixes the plurality of underwater bearings, and a second protective tube that is provided around the first protective tube via a gap and communicates with the first protective tube A first communication pipe for supplying or recovering a lubricating liquid that communicates with the first protective pipe and the outside of the vertical pump, and a communication between the second protective pipe and the outside of the vertical pump. A second communication pipe for collecting or supplying the lubricating liquid, and the second communication pipe is located above the vertical pump at a position higher than the upper end of the discharge bowl containing the impeller. It is characterized by communicating.

  In one form of the underwater bearing structure, the first protective tube and the second protective tube extend from the inside of the discharge bowl to a position higher than the upper end portion of the discharge bowl, and the first communication tube The pipe extends from a position higher than the uppermost submersible bearing among the plurality of submersible bearings to the outside of the vertical pump, and the second communication pipe extends from a position higher than the upper end of the discharge bowl from the vertical pump. It may be configured to extend to the outside.

  In one form of the submersible bearing structure, the first communication pipe extends from a position higher than the uppermost submersible bearing inside the casing of the vertical shaft pump to the outside of the casing, and the second communication pipe is The configuration may be such that the casing extends from a position higher than the upper end of the discharge bowl inside the casing to the outside of the casing.

  In one form of the underwater bearing structure, the first protective tube extends from the inside of the discharge bowl to the outside of the casing of the vertical shaft pump, and the first communication tube is formed of the first protective tube. The second communication pipe may be connected to a portion extending outside the casing, and the second communication pipe may extend from a position higher than an upper end portion of the discharge bowl inside the casing to the outside of the casing.

Moreover, in one form of the underwater bearing structure, the second protective pipe is moved from the inside of the discharge bowl to a position higher than the intermediate floor that is lower than the installation floor where the vertical shaft pump is installed and higher than the discharge bowl. The second communication pipe may extend from a position higher than the intermediate floor in the casing of the vertical shaft pump to the outside of the casing.
An underwater bearing structure characterized by that.

  In one form of the underwater bearing structure, the first communication pipe or the second communication pipe may be installed along an underwater bearing support that supports the underwater bearing.

  In one form of the underwater bearing structure, the first protective pipe and the second protective pipe extend from the inside of the discharge bowl to the outside of the casing of the vertical shaft pump, and the first communication pipe is The first protective pipe may be connected to a portion extending outside the casing, and the second communication pipe may be connected to a portion of the second protective pipe extending outside the casing.

  In one form of the underwater bearing structure, the first protective tube and the second protective tube may be arranged concentrically about the axis of the rotating shaft.

  Also, one aspect of the vertical shaft pump of the present invention is a rotating shaft extending in the vertical direction, an impeller attached to the rotating shaft, a guide vane for rectifying a water flow discharged upward from the impeller, and the guide It is characterized by comprising a casing partially including a discharge bowl containing blades and any one of the above-described underwater bearing structures.

  According to such an embodiment of the present invention, the structure and manufacturing restrictions of the discharge bowl due to the routing of the piping, the influence of the rectification performance by the guide blades of the discharge bowl, the risk of wear of the guide blades, and the installation are further reduced. It is possible to provide an underwater bearing structure and a vertical shaft pump that can be installed with a minimum hole diameter such as a floor.

FIG. 1 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a first embodiment. FIG. 2 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a second embodiment. FIG. 3 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a third embodiment. 4 is a top view of the cross section taken along the line X-X ′ in FIG. FIG. 5 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a fourth embodiment. FIG. 6 is a diagram showing an overall configuration of a conventional vertical shaft pump to which a lubricating water recovery pipe is attached. FIG. 7A is a state diagram of the impeller and the guide vane as seen through the casing of the vertical shaft mixed flow pump, and FIG. 7B is a plan view of the guide vane as viewed downward from the shaft side.

  First, the outline | summary of the submerged bearing structure and vertical shaft pump of this embodiment is demonstrated.

The present embodiment includes a first protective tube (inner protective tube) that includes the shaft and all the underwater bearings that support the shaft, and fixes the bearing. In the present embodiment, the space between the shaft and the inner protective tube is used as a flow path (or return flow channel) for lubricating water, and a protective tube is further provided on the outer periphery of the inner protective tube. The space between the inner protective tube and the outer protective tube is a double protective tube structure as a lubricating water return flow path (or forward flow path), and the double protective tube structure is discharged from the inside of the discharge bowl and the upper end of the bowl Extends upwards. In other words, the outer protective tube extends above the upper end of the discharge bowl, a pipe for collecting or supplying lubricating water extends from the upper end of the outer protective tube to the outside of the casing, and the inner protective tube A vertical shaft pump characterized in that piping for supplying or collecting lubricating water extends from the upper side of the bearing to the outside of the casing.

  As a result, there is no need to provide a communication pipe and a lubricating water recovery pipe inside the discharge bowl, so there are no restrictions on the structure and manufacturing of the discharge bowl, The risk of wear can be reduced. In addition, in a vertical pump with a discharge bowl portion having a larger diameter than other casing portions, the piping for collecting or supplying the lubricating water extends from the position higher than the discharge bowl portion to the outside of the casing. It can be installed with a small hole diameter.

  More preferably, by providing a double protective pipe structure from the inside of the discharge bowl to the height level of the intermediate floor, and providing a position where a pipe for collecting or supplying lubricating water extends outside the casing above the intermediate floor, It is possible to avoid the contact between the intermediate floor and the piping for collecting or supplying the lubricating water, and to install in a state where the hole diameter of the installation floor at the time of installation is smaller.

  Even more preferably, since the underwater bearing support fixed to the casing extends at a position where the underwater bearing is located to support the inner protective tube or the outer protective tube, the lubricating water is collected or supplied along the underwater bearing support. By installing the piping to be performed, it is possible to further reduce the influence on the flow by the piping for collecting or supplying the lubricating water and the influence of the abrasion due to the slurry.

  Even more preferably, by providing the inner protective tube and the outer protective tube concentrically about the axis of the shaft, symmetry from the central axis is ensured, and the occurrence of drift related to the pump flow can be reduced.

  Even more preferably, a double protective pipe structure is provided from the inside of the discharge bowl to the height level of the installation floor, and a position where a pipe for collecting or supplying lubricating water extends outside the casing is provided above the installation floor. It is possible to avoid the contact between the installation floor and the intermediate floor and the piping for collecting or supplying the lubricating water, and to install the installation floor and the like with a smaller diameter in the installation floor.

  Even more preferably, a double protective pipe structure is provided from the inside of the discharge bowl to the height level outside the elbow, and a pipe for collecting or supplying lubricating water from the upper end portion of the double protective pipe is provided. The installation floor and piping for collecting or supplying lubricating water can be avoided and installed safely.

  According to the submersible bearing structure and the vertical shaft pump of the present embodiment, the lubricating water recovery pipe is discharged as in the prior art by using a double-structure protective pipe to circulate the lubricating water of the submersible bearing. The lubricating water recovery pipe can be pulled out from a position above the intermediate floor having a small opening hole diameter without being pulled out from the center. As a result, the pump can be easily installed and the production efficiency can be improved as compared with the conventional apparatus.

  In addition, the protective tube completely protects the handling liquid from the lubricating water flowing inside, so that the handling liquid is not mixed into the lubricating liquid, and the wear damage to the underwater bearing member due to the impurities of the handling liquid does not occur. The advantages of the conventional technology are fully utilized.

  At the same time, by moving the position of the communicating pipe from the complicatedly shaped discharge bowl including the three-dimensional wing to the simpler submerged bearing support, casting of the discharge bowl is simplified and the production efficiency is increased. be able to.

  Hereinafter, the embodiments of the submersible bearing structure and the vertical shaft pump will be specifically described with reference to FIGS. 1 to 5.

<First Embodiment>
FIG. 1 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a first embodiment. The vertical shaft pump 1000 includes a rotary shaft 1002 extending in the vertical direction, an impeller 1003 attached to a lower end portion of the rotary shaft 1002, and a drive unit (not shown) that is provided at the upper end of the rotary shaft 1002 and rotationally drives the rotary shaft 1002. A guide vane 1020 provided at the upper part of the impeller 1003 to rectify the water flow discharged upward from the impeller 1003, and a cylindrical casing 1008 surrounding the rotary shaft 1002, the impeller 1003, and the guide vane 1020. Prepare.

  Further, the vertical shaft pump 1000 includes an underwater bearing structure 1200 that supports the rotating shaft 1002. The underwater bearing structure 1200 includes a plurality of underwater bearings 1021A, 1021B, and 1021C that support the rotating shaft 1002. The underwater bearing structure 1200 includes a protective tube 1027 for circulating and supplying a lubricating liquid from the outside of the casing 1008 to the plurality of underwater bearings 1021A, 1021B, and 1021C. The vertical shaft pump 1000 is a pump that pumps water upward from below through the casing 1008 by rotating the impeller 1003. The guide blade 1020 converts the swirling component of the water flow pumped by the impeller 1003 into a vertically upward component.

  The casing 1008 includes four parts. That is, the casing 1008 is connected to the suction bell 1004 which is a pump suction port, the discharge vane 1005 containing the guide vane 1020 and the underwater bearing 1021A, and is suspended above the discharge bowl 1005 and extends to a desired height to pump water. A down pipe 1006 (hanging pipes 1006A and 1006B) and a discharge elbow 1007 that changes the flow direction of the pumped water connected to the hanging pipe 1006 in a desired direction are included. The suction bell 1004, the discharge bowl 1005, the suspension pipe 1006, and the discharge elbow 1007 are each connected by a flange to constitute a casing 1008 of the vertical shaft pump 1000. The suction bell 1004 is formed in a bell mouth shape. The discharge bowl 1005 is formed in a cylindrical shape that surrounds the guide blade 1020, and is formed so that the diameter of the cylinder expands along the extending direction of the rotating shaft 1002 and then decreases. The suspension tubes 1006A and 1006B are formed in a cylindrical shape surrounding the rotation shaft 1002. The discharge elbow 1007 is formed so as to change the direction in the horizontal direction after extending in the vertical direction along the rotation axis 1002.

  The underwater bearings 1021A, 1021B, and 1021C are sliding bearings that are provided apart from each other along the rotation shaft 1002. The underwater bearing 1021A is disposed at the height of the discharge bowl 1005. The underwater bearing 1021B is disposed at the height of the suspension pipe 1006A, and is supported by the suspension pipe 1006A by the underwater bearing support 1022A. The underwater bearing 1021C is disposed at the height of the suspension pipe 1006B, and is supported by the suspension pipe 1006B by the underwater bearing support 1022B. The vertical pump 1000 itself has a suspension pipe 1006 inserted into an opening hole 1101 of the installation floor 1100 and is fixed to the installation floor 1100 below the discharge elbow 1007.

  The rotating shaft 1002 is supported by underwater bearings (sliding bearings) 1021A, 1021B, and 1021C. In order to prevent the slurry from flowing into the underwater bearings 1021A, 1021B, and 1021C and to feed the lubricating water even when the vertical shaft pump 1000 is stopped, in the underwater bearing structure 1200 of the present embodiment, the protection tube 1027 has a first protection tube (inside Protection tube) 1023 and a second protection tube (outer protection tube) 1026.

  The first protective tube 1023 is a cylindrical member that includes the underwater bearings 1021A, 1021B, and 1021C and fixes the underwater bearings 1021A, 1021B, and 1021C. The first protective tube 1023 extends from the inside of the discharge bowl 1005 to a position higher than the upper end (outer) of the discharge bowl 1005. Specifically, the first protective tube 1023 extends from a position higher than the uppermost underwater bearing 1021C to below the underwater bearing 1021A in the discharge bowl 1005.

  The underwater bearing structure 1200 also includes a first communication pipe 1024A for supplying or collecting a lubricating liquid that communicates the first protective pipe 1023 with the outside of the vertical shaft pump 1000. The first communication pipe 1024A communicates with the outside of the casing 1008 in order to supply or collect the lubricating water at the first end, and the submersible bearing 1021C at the top of the first protective pipe 1023 at the second end. Connected to a higher position. Specifically, the first communication pipe 1024A extends from the position higher than the uppermost underwater bearing 1021C of the first protective pipe 1023 inside the casing 1008 to the outside of the casing 1008. In other words, the first protective tube 1023 is connected to the first communication tube 1024A that communicates with the outside through the wall surface of the discharge elbow 1007 that is a part of the casing 1008 at a certain portion above the uppermost underwater bearing 1021C. ing. In the present embodiment, the lubricating water is stored in a water tank 1102 provided on the installation floor 1100 outside the vertical shaft pump 1000, and is sent to the first communication pipe 1024A by a submersible pump or the like.

  The lubricating water supplied from the first communication pipe 1024A to the upper side of the first protective pipe 1023 is fed from the submersible bearing 1021C through the submersible bearing 1021B and the submersible bearing 1021A in this order, and the first in the discharge bowl 1005. The first protective tube 1023 exits from the lowermost opening of the protective tube 1023. Inside the discharge bowl 5, there is provided a bowl member 1029 in which a space 1028 is formed which communicates with the lowermost opening of the first protective tube 1023 and receives the lubricating water flowing down from the first protective tube 1023. It has been. The lubricating water flowing down from the first protective tube 1023 changes the flow direction upward by the bowl member 1029.

  On the other hand, the second protective tube 1026 is provided around the first protective tube 1023 through a gap and communicates with the first protective tube 1023 through the space 1028. The second protective tube 1026 extends from the inside of the discharge bowl 1005 to a position higher than the upper end (outer) of the discharge bowl 1005. The second protective tube 1026 extends upward from the upper part of the bowl member 1029 and communicates with the space 1028.

  The underwater bearing structure 1200 includes a second communication pipe 1024B for collecting or supplying a lubricating liquid that communicates the second protective pipe 1026 and the outside of the vertical pump 1000. The second communication pipe 1024B communicates with the outside of the vertical shaft pump 1000 at a position higher than the upper end portion of the discharge bowl 1005 containing the impeller 1003. The second communication pipe 1024B has a first end communicating with the outside of the casing 1008 in order to collect or supply lubricating water, and a second end is the upper end of the discharge bowl 1005 of the second protective pipe 1026. It is connected to a position higher than the section. In other words, the second protective tube 1026 is connected to the second communication tube 1024B that communicates with the outside of the suspension tube 1006A that is a part of the casing 1008 at a certain portion above the discharge bowl 1005.

  Lubricating water that has flowed from the lowermost opening of the first protective tube 1023 to the space 1028 and changed the flow upward in the space 1028 passes through the second protective tube 1026 and the second communication tube 1024B to the casing. Water is sent to the outside of 1008. A lubricating water recovery pipe 1025 is connected to the first end of the second communication pipe 1024B. The lubricating water sent to the outside of the casing 1008 is sent upward through the lubricating water recovery pipe 1025 and returned to the water tank 1102 provided on the installation floor 1100.

  Note that it is preferable to provide a first protective tube 1023 and a second protective tube 1026 concentrically about the axis of the rotation shaft 1002 to form a double tube structure. Thereby, the symmetry from a central axis is ensured and generation | occurrence | production of the drift regarding the flow of the vertical shaft pump 1000 can be reduced. Further, in the present embodiment, the example in which the lubricating water is supplied from the first communication pipe 1024A and the lubricating water is collected from the second communication pipe 1024B is shown, but the present invention is not limited thereto, and the second communication pipe 1024B is used. Lubricating water can be supplied and the lubricating water can be recovered from the first communication pipe 1024A.

  According to the present embodiment, since it is not necessary to provide the second communication pipe 1024B inside the discharge bowl 1005, there is no restriction on the structure and manufacturing of the discharge bowl 1005, and the guide vanes 1020 of the discharge bowl 1005 are rectified. The impact on performance and the risk of wear can be reduced. Further, in the vertical shaft pump 1000 in which the discharge bowl 1005 has a larger diameter than other casing parts (such as the suspension pipes 1006A and 1006B), a second communication pipe that collects or supplies lubricating water from a position higher than the discharge bowl 1005. Since 1024B extends outside the casing, it can be installed even when the diameter of the opening hole 1101 such as the installation floor 1100 at the time of installation is small.

Second Embodiment
FIG. 2 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a second embodiment. A vertical pump 2000 according to the second embodiment is a modification of the vertical pump 1000 according to the first embodiment. Therefore, the description will focus on the points that are different from the vertical pump 1000 of the first embodiment, and the description of the same parts as the vertical pump 1000 of the first embodiment is omitted.

  In the first embodiment, two of the first communication pipe 1024A and the second communication pipe 1024B are communicated from the rotating shaft 1002 side to the casing 1008 side, but the casing 1008 is processed for the communication pipe. Therefore, there is a concern about the decrease in productivity. Further, there is a concern that an appropriate strength is required for the communicating pipe joint portion of the casing 1008 against the vibration of the casing 1008. The second embodiment addresses such concerns.

  In FIG. 2, the first protective tube 1023 contains the underwater bearings 1021A, 1021B, and 1021C in order to prevent the slurry from flowing into the underwater bearings 1021A, 1021B, and 1021C and to feed the lubricating water even when the vertical pump 2000 is stopped. The underwater bearings 1021A, 1021B, and 1021C are fixed. Further, in the present embodiment, the first protective tube 1023 extends from below the underwater bearing 1021A inside the discharge bowl 1005 to above the uppermost underwater bearing 1021C, and further extends along the rotary shaft 1002. The discharge elbow 1007 is penetrated.

  The first communication pipe 1024 </ b> A is connected to the first protective pipe 1023 at a position after the discharge elbow 1007 has penetrated (a portion extending to the outside of the casing 1008). Lubricating water is fed from the water tank 1102 provided on the installation floor 1100 outside the vertical shaft pump 2000 to the first communication pipe 1024A.

  According to the present embodiment, in addition to the function and effect of the first embodiment, the communication pipe penetrating the casing 1008 may be one of the second communication pipes 1024B, so that the manufacture of the casing 1008 becomes simpler. Further, there is less concern that an appropriate strength is required for the communicating pipe joint portion of the casing 1008 against the vibration of the casing 1008.

  More preferably, the double protective pipe structure has a second communication pipe 1024B extending from the second protective pipe 1026 to the outside of the casing 1008 from the inside of the discharge bowl 1005 to a level higher than the intermediate floor 1103. Can be provided above the intermediate floor 1103. According to this, contact between the intermediate floor and the lubricating water recovery pipe 1025 can be avoided, and the installation can be performed in a state where the hole diameters of the opening holes 1101 such as the intermediate floor 1103 and the installation floor 1100 at the time of installation are smaller.

Even more preferably, the double protective tube structure extends from the inside of the discharge bowl 1005 to the height level of the installation floor 1100 and extends from the first protective tube 1023 and the second protective tube 1026 to the outside of the casing 1008. By providing the positions of the first communication pipe 1024A and the second communication pipe 1024B above the installation floor, contact between the installation floor and the intermediate floor and the first communication pipe 1024A and the second communication pipe 1024B can be avoided. It can be installed in a state where the hole diameters of the opening holes 1101 such as the intermediate floor 1103 and the installation floor 1100 at the time of installation are smaller.

<Third Embodiment>
FIG. 3 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a third embodiment. 4 is a top view of the cross section taken along the line XX ′ of FIG. A vertical pump 3000 according to the third embodiment is a modification of the vertical pump 2000 according to the second embodiment. Therefore, the description will be focused on the points different from the vertical pump 2000 of the second embodiment, and the description of the same parts as the vertical pump 2000 of the second embodiment will be omitted.

  In the second embodiment, since the second communication pipe 1024B communicates from the rotating shaft 1002 side to the casing 1008 side, there is a concern about ensuring appropriate strength of the communication pipe joint portion of the casing 1008 against vibration of the casing 1008. Remain. In addition, there is a concern that the second communication pipe 1024B may become a fluid resistance of the vertical shaft pump 2000 and cause performance degradation. The third embodiment further addresses such concerns.

  3 and 4, the second protective tube 1026 extends to the submersible bearing support 1022 </ b> A above the discharge bowl 1005. The underwater bearing support 1022A has four support columns 1030A to 1030D extending from the casing 1008 in the direction of the rotation shaft 1002. The second communication pipe 1024B is arranged along the extending direction of the underwater bearing support 1022A at the lower portion, that is, the upstream side of one of the four columns 1030A to 1030D. The second communication pipe 1024B has one end connected to the second protective pipe 1026 and the other end communicating with the outside of the casing 1008.

  According to the third embodiment, in addition to the effects of the second embodiment, the second communication pipe 1024B connected to the casing 1008 is a portion of the underwater bearing support 1022A having a high structural strength. Since it is arranged along the direction in which the support pillars 1022A extend, there is less concern that an appropriate strength is required for the communicating pipe joint portion of the casing 1008 against the vibration of the casing 1008. Moreover, since only the fluid resistance by the submerged bearing support that is originally arranged can be achieved, there is less concern about performance degradation due to the fluid resistance of the second communication pipe 1024B.

  In the third embodiment, the second communication pipe 1024B is disposed on the upstream side of the column of the underwater bearing support 1022A. However, the submerged bearing support 1022A may be disposed on the downstream side of the column or along the side surface of the column. It may be cast in the column. Moreover, the number of the support | pillars of the underwater bearing support 1022A is not limited to four. In FIG. 3, the communication pipe along the underwater bearing support 1022A is the second communication pipe 1024B. However, the first communication pipe 1024A may be arranged in the same manner using the underwater bearing support 1022B. Is possible.

<Fourth embodiment>
FIG. 5 is a diagram illustrating an underwater bearing structure and a vertical shaft pump according to a fourth embodiment. A vertical pump 4000 according to the fourth embodiment is a modification of the vertical pump 3000 according to the third embodiment. Therefore, the description will be focused on the points different from the vertical pump 3000 of the third embodiment, and the description of the same parts as the vertical pump 3000 of the third embodiment will be omitted.

In the third embodiment, since the second communication pipe 1024B communicates from the rotary shaft 1002 side to the casing 1008 side, the processing for the communication pipe in the casing 1008 may cause a decrease in productivity. Is done. Furthermore, the positional relationship between the first communication pipe 1024A and the second communication pipe 1024B is difficult to standardize because the floors are separated and the pipes are not integrated in the layout. In addition, when installing and removing the vertical shaft pump from the pump station,
It is easier to work on the same floor where the lubrication system is installed and removed. The fourth embodiment further addresses such concerns.

  In FIG. 5, the second protective tube 1026 extends above the discharge bowl 1005 along the rotation shaft 1002 and further passes through the discharge elbow 1007. A second communication pipe 1024B is connected to the second protective pipe 1026 at a position after the discharge elbow 7 has passed through (a portion extending to the outside of the casing 1008). Lubricating water is fed from the second communication pipe 1024B toward the water tank 1102 provided on the installation floor 1100 outside the vertical shaft pump 4000.

  According to the fourth embodiment, in addition to the operational effects of the third embodiment, there is no communication pipe connected to the casing 1008, and there is no concern regarding the manufacture of the casing 1008. Further, since the positional relationship between the first communication pipe 1024A and the second communication pipe 1024B is the same floor, the pipes are close together and are easy to standardize because they are grouped in the layout. In addition, when installing and removing the vertical shaft pump 4000 from the pump station, it is easy to attach and remove the lubricating water system.

  In addition, as the lubricating water in the first to fourth embodiments, various liquids such as tap water, industrial water, and a handling liquid for cleaning installed in a pump station can be used.

  Also, the method of storing the lubricating water in the water tank 1102 and pumping and circulating it with the submersible pump has been described. However, the pump is not limited to the submersible pump, and any pump may be used as long as the pump satisfies the lubrication flow path system. .

  In the first to fourth embodiments, the case where there is no filter for purifying the lubricating water is described. However, in some cases, the filter may be placed in the lubricating water circulation path to purify the lubricating water.

  In addition, as the material of the first protective tube 1023 and the second protective tube 1026, when a metal material is used, a metal having corrosion resistance such as SUS can be used. However, the metal and the resin material are not limited to SUS. A composite material or the like may be used.

  Further, in the first to fourth embodiments, the description has been made assuming that the outgoing flow path of the lubricating water is inside the double pipe, the return flow path is outside the double pipe, and the lubricating water recovery pipe 1025 is the return pipe. It was. However, the present invention is not limited to this, and the circulating flow path is in the opposite direction, that is, the lubricating water recovery pipe 1025 is lubricated with the outgoing flow path of the lubricating water outside the double pipe and the return flow path inside the double pipe. It can also be a water pipe.

  In the first embodiment to the fourth embodiment, the water tank 1102 for temporarily storing the lubricating water has been described with reference to the installation floor 1100. However, the water tank 1102 can be used by the user such as the intermediate floor 1103, for example. It can also be installed in an appropriate place according to the demand.

  As mentioned above, although embodiment of this invention has been described based on 1st Embodiment-4th Embodiment, 1st Embodiment-4th Embodiment is for making an understanding of this invention easy. The present invention is not limited to this. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Moreover, in the range which can solve at least one part of the subject mentioned above, or the range which exhibits at least one part of an effect, the combination of each component described in the claim and the specification, or omission is possible. .

1000, 2000, 3000, 4000 Vertical shaft pump 1002 Rotating shaft 1003 Impeller 1004 Suction bell 1005 Discharge bowl 1006, 1006A, 1006B Suspension pipe 1007 Discharge elbow 1008 Casing 1020 Guide blade 1021A, 1021B, 1021C Underwater bearing 1023 Protective pipe 1024A First communication pipe 1024B Second communication pipe 1025 Lubricating water recovery pipe 1026 Second protective pipe 1027 Protective pipe 1028 Space 1029 Bowl member 1100 Installation floor 1101 Open hole 1102 Water tank 1103 Intermediate floor 1200 Underwater bearing structure

Claims (11)

An underwater bearing structure that supports a rotating shaft to which an impeller of a vertical shaft pump is attached,
A part of a casing of the vertical shaft pump, comprising a discharge bowl containing the impeller, guide vanes for rectifying pumping of the impeller, and a submerged bearing that supports the rotary shaft;
A first protective tube fixed to front enclosing bearing in Kisui,
A second protective tube provided around the first protective tube via a gap and communicating with the first protective tube in the discharge bowl ;
A first communication pipe for supplying or collecting a lubricating liquid, which communicates the first protective pipe and the outside of the casing of the vertical pump;
A second communication pipe for collecting or supplying a lubricating liquid that communicates the second protective pipe and the outside of the casing of the vertical shaft pump;
It said first communicating tube and said second communicating tube communicates with the outside of the casing of the standing shaft pump at a position higher than the upper end portion of the front Ki吐 out bowl,
An underwater bearing structure characterized by that. The underwater bearing structure according to claim 1,
A plurality of underwater bearings that support the rotating shaft at a position higher than the upper end of the discharge bowl;
The first protective tube and the second protective tube extend from the inside of the discharge bowl to a position higher than the upper end of the discharge bowl,
The first communication pipe extends from a position higher than the uppermost submerged bearing among the plurality of submersible bearings to the outside of the vertical shaft pump,
The second communication pipe extends from a position higher than an upper end of the discharge bowl to the outside of the casing of the vertical pump.
An underwater bearing structure characterized by that. The underwater bearing structure according to claim 1 or 2,
The first communication pipe extends from a position higher than the uppermost submersible bearing inside the casing of the vertical shaft pump to the outside of the casing,
The second communication pipe extends from a position higher than the upper end of the discharge bowl inside the casing to the outside of the casing.
An underwater bearing structure characterized by that. The underwater bearing structure according to claim 1 or 2 ,
The first protective tube extends from the inside of the discharge bowl to the outside of the casing of the vertical shaft pump,
The first communication pipe is connected to a portion of the first protective pipe extending to the outside of the casing;
The second communication pipe extends from a position higher than the upper end of the discharge bowl inside the casing to the outside of the casing.
An underwater bearing structure characterized by that. The underwater bearing structure according to claim 1 or 2 ,
The second protective pipe extends from the inside of the discharge bowl to a position higher than an intermediate floor that is lower than an installation floor on which the vertical pump is installed and higher than the discharge bowl,
The second communication pipe extends from a position higher than the intermediate floor inside the casing of the vertical shaft pump to the outside of the casing.
An underwater bearing structure characterized by that. The underwater bearing structure according to any one of claims 1 to 5,
The first communication pipe or the second communication pipe is installed along an underwater bearing support that supports the underwater bearing.
An underwater bearing structure characterized by that. The underwater bearing structure according to claim 1 or 2 ,
The first protective tube and the second protective tube extend from the inside of the discharge bowl to the outside of the casing of the vertical pump,
The first communication pipe is connected to a portion of the first protective pipe extending to the outside of the casing;
The second communication pipe is connected to a portion of the second protective pipe extending to the outside of the casing;
An underwater bearing structure characterized by that. In the underwater bearing structure of any one of Claims 1-7,
The first protective tube and the second protective tube are arranged concentrically around the axis of the rotating shaft,
An underwater bearing structure characterized by that.   The underwater bearing structure according to claim 1,
  An underwater bearing structure, wherein an outer diameter of the discharge bowl is larger than an outer diameter of another casing.   The underwater bearing structure according to claim 1,
  The submerged bearing structure, wherein the vertical shaft pump is a vertical shaft diagonal flow pump or a vertical shaft axial flow pump. A rotation axis extending in the vertical direction;
An impeller attached to the rotating shaft;
Guide vanes that rectify the water flow discharged upward from the impeller,
A casing partially including a discharge bowl containing the guide vanes;
The underwater bearing structure according to any one of claims 1 to 8,
A vertical shaft pump comprising: